In CdS, CdSe, and CdTe investigations of both reflectivityby polarimetric methodsand transmission are made in the spectral region of energies higher than the exciton ground state. An additional structure at energies of approximate Eex + ELO is explained by indirect exciton transitions with phonon emission and compared with simple second-order perturbation theory taking into account ground exciton states only. The observed shift towards lower energies can be ascribed to the configuration interaction.In CdS, CdSe und CdTe wurden sowohl die Reflexion mit polarimetrischen Methoden als auch die Transmission fiir Enqgien groBer als der Exzitonengrundzustand untemcht.Eine zusiitzliche Struktur bei Energien von etwa Be, + ELO wird durch indirekte Exzitoneniibergiinge unter Phononenemission gedeutet und mit einer einfachen Stijrungstheorie zweiter Ordnung unter alleiniger Beriicksichtigung des Exzitonengrundzustandes verglichen. Die beobachtete Verschiebung zu niedrigeren Energien kann einer Konfigurationswechmlwirkung zugeschrieben werden.
The thermal resistance at boundaries between indium and single crystal sapphire has been measured with the indium superconducting and normal. The effective temperature at the sapphire side of a boundary was determined from the condition of radiative equilibrium at the surfaces of the crystal. It was found that the thermal conductance of indium-sapphire boundaries can be represented by the sum of a T 2 term and a T 3 term. For two samples, the T d terms are, respectively, 0.0295T 3 and 0.0281T 3 d=0.0016r 3 W/(cm 2 -deg). These numbers are within the range of possible values expected on the basis of the acoustic mismatch theory of Little. For the two samples the T 2 terms are 0.0059T 2 and 0.0098T 2 ±0.001T 2 TF(cm 2 -deg) with the indium superconducting, and are increased by (l=b0.4)XlO~3T 2 when the indium is normal. The values obtained as a matter of course for the thermal conductivity of sapphire are in agreement with the Casimir theory as modified to include the effects of finite crystal length and specular reflection of phonons at the crystal surfaces.
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